Portion of a shoe



FIG. 1 is a side view of a portion of a shoe showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken lines in the Figures show environment for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of a shoe, as shown and described. 